Attachment to sewing machines



June 5, 1923. 1,457,547

' R. NETTER ATTACHMENT TO SEWING MACHINES Filed May 17, 1921 Patented.lune 5, i923.

UNiTE stares mm1. Nnm'rnn, or

NEW YORK, N. Y.; ADELAIDE FOLLET NEr'rEn sArn miranti. Nn'rfrnn,Dncuiisni).l

f ATTACHMENT 'To SEWINGA MncHiNEs.

AApplication mea may 17, 192i. seriai No. 470336.

To aZZ whom t may concern.' f

Be it, known that I, RAPHAL Numa, a citizen ofthe Republic of France,residing at New York, county of New York, and State of New" York, haveinvented certain: new -and useful Improvements in Attachments to Sewingi achines, of which? the following is a full, clear, and exactdescription.

Sewing machines at the presenttime are generally Iprovided withattachments known as hemmers, which consist of spirally formed foldingguides designed 'to be secured in ad@ vence ofthe needle and feedingmechanism' whichoperatev lto fold over the edge of a: piece of fabricbefore it reaches the needle to yform a true hem or the-edges of two suerposed fabrics to form a fell. Y 'I uch devices usually require ltheworkvof a skilled operative, as it is very frequently the case that theedges of the vfabric are not tempts havebeen made to'de'vise and operatesuch a device, until Idesigned and appliedv the corrective appliance forthis purpose which forms the subject of this application 40 for LettersPatent. This new devicey as l have designed'it,lconsists in a cuttingrcie# vice which is appliedin y ofthe feed mechanism and needle and atthe entrance to the folding guide, which ycuts from the raw edge of anvintroduced yfabric 'a narrow strip, along aline which leaves'a straightedge or `has always a definite relation to the foldededge`v that passes`to the needle. Y' n v l front or iny advancey yPractical considerationsrequire that' a cutting device be'operated by the machine itself-and'atva proper speed.; that it occupy but'little space; that it, shall becapable of l long-continued use without' attention; and; thatv ity thatitV beso designed and operated takes from the 'operativethe' vburden ofskill! ful manipulation. These' v`are problems 'that iixnculminationy i'haw been by nomeans easy of eolution,butv :if 'i IE have vsucceeded insolving them' and-:pro-v l ducing. val simple, durable'and very 'highlyefficient attachment for the purpose.

In carrying out' this invention attach in any suitable manner to the.machine agout# ting devi'cevhaving a fixcdand an ,oscillating-` orreciprocating member, @at vor near *the point where theintroducedlfabric:entersfthe folding spiral of 'the henimerfhguider,1'The proper movement yof vvthe 'reciprocatingmeme ber is secured byconnections hereinafter 'dei scribed, to a suitable member of thesew ingmachine', such as the 'rocker lshaft]which`V usually lie's'Yunder thetable and which'raise's the movable member of the feed mechanism, andthese connectionsare' so Constr-neted:and

designed that the reciprocating cutterl member ,is moved to out thefabric'whifle'fthe i feed mechanism ofthe machine isatrest'fV This'vimproved attachment I have shown in'detail i'n thev accompanyingdrawings,n in` what:

Figure' lis' a'sectio'nal view ofthe"es'seril vtial parts of a sewing'machine showing impmved attachment, applied thereto."

1 lFig.r4 '2 lis. a sectionalv 'detail' of the, cutter`device-andas'sociated parts onthe lineQF-Q of F'igjgt v Y,

showniin'Fig. '1, and c l Fig; 4 is-averticaldetail on the line :4%4

'The improvement i`s` concerne"diincidentally only'with the'pla'nofAconstruction of y the lsewingmachine asfafwhole, and Itlrat shown-maylbe regarded' as 'typical yof*y I the i `form toffwhich it? is 'or 'may'be'fapplie'ld. F. n sueh'machine 'fis the'table, 2 sthe presser foot, 3isthe needle-under'awhichfis'the' proper feedmechanisni, andunderthetable;

- truer-he..

is above stated, the lfLW @dgofthe fabric' i es.. by; e) Serew 13,v te.Ythe, erm

v. To effect suclioperation by power derivedin this case, are tWo rockershafts 4 and 5, the former oscillating the feed bed 6, the latterraising the same, in av manner familiar to all who are skilled in theart.

When this or any similar sewing machine is to be used tov hem, asuitably formed spiral folder, guide is secured to the table in advanceofthe feed mechanism and needle, and in using this device the edge ofthe febrete belierimeel. ispeseeeinte the. guide unfit iesfairen holdA-Of by the @spinning and reciprocating feed bed `and thereby passedunder the needle. InI passing through the guide 7 the edgesare`fold'eduiider and over so that the line ofstitches is along thedfolded portions and the latter issue as a is apt tobbeJ unevenAWith,resulting imperfecf tensfr the finished. hemmedfedge. lather@-ORQ. SQQLLITQO the. table. in. any proper4 manner, aswbysreyv; 8 alUfshapedv support. 9y in stationery. These partsV which iseeeured byesereni@ the member. 1.1 0f e Cutting deviceare`4 secured ati theentrance to the spiralv felderI guide@ the edge. ef. the member. l1

being adjusted., properly' with reference tof the n'iovable memberIofthe cutter, 12 sothat the lineof out vvyillbe sufliciently into thefehieftetele. eere. et any. irregularities, that erelkelrteeeeur,intherev edge The 'saidlmoyable member 12 is, clamped, A' 1li of a rock shaftlzlpa'ssingi through, a cylindrical guide 1.6.5,". A v'111112.47 throughuheh said shaft peeeesieeereuedinte the end= O-f'thie Cylinder. andetvgeen saidnut andv a,l shoulder on thel reelaehefts e'A spireli Spring18, which.. exe erts sufficient pressureupon the shaft to keeptheyknifeblade 12Min proper positionI ifelaitirely *lathe fixed. memberll l The function of the rock shaft 15 is to oscillate, oryreciprocat'ej the knife blade l2, causingmitin cooperation with thestationary/,knife member llyto cut the fabric durnghe, intervalsefifreet ef the Seid fabriefromthe machine is, anice problem, TheIrlQFeIelltS. must be. eXeCtly timed end must occur Wuithl the'A samelrapidity asthe oscillations, of the needle, andthe most practicableWaylwl have found for accomplishing this is to operate the movable knifeby the intermittently, moving, rocker shaftv 5, which lifts the feed bed6. For this purpose, I- sef Cure to the said shaft. 5 a bracket l9 byany suitable means, and connect the extended, arinvofV such` bracket bya, link,20 with a. lever 2l, p fiyoted.` atA 22Vto a stationary, partofthe machine, and connect said lever2l by a link 23ltoan arm 24, fixedvto therock shafty l5.

.By thismeans' as the rocker bar 5 oseillates,

i an1.oscillatory movement.' of sufficient extent is 'imparted to theshaft 15 to` operate the knifeblade l2 andas the shaft 5 isstationary atthe moment when the feed bed 6 is at rest and the needle moving, themovements of the knife will be properly timed.

Certain special provisions and details are of prime importance andshould be carefully taken into consideration. To vary the throw of.4the, knife blade l2, for example, tocompensa-te for possible Wear orother contingencies due provision should be made for varynethe peint eteereeetien betweeethe link 22a-and, the '1eyer'a'1-L/igain, in Orderthat the line of'cut should be at the proper point, the knife blade 12as shown in Fig. 3, should be offset andenter a cut-away part in theside of the spiral; guide 7 back of the opening or mouth of the saidguide, which mouth serves to hold the fabric during the` cutting,Aoperation. While the topvvall of the guide acts asy a stripper. Withthis construction. no, special feed dog or other feedr mechanism is.required in advance of the cutter and guide. Furthermore the said knifeblade should be normally in such position that it will-ah Weyslie over acorner of thejstetenery. mem,- bei ll to insure the proper relativepositions, of these two members at all times. Finally, it will, beobSrvel that suitable provisionis mede for the adjustment ofthe. t.nsien et.; the springlS, by the nut Hand for thewadjustment of thestationary knifermember, 1l with. respect,A to the` other parte with`whieh it isr associated.. Y

With thisA machinel theL edge, of anyI falo-ric which is to behemmed,isjpassedinto, the,

It is not essential that the knife blzulejbe.

Operated by the epeee mee-11S.l herein` ehem, althpugh thesevare themostlpracticablethagt l have, thusy far found. Nor-is tliejinyenrV tionlimited tothe specigform or charagtei; of the` means employed forcarrying .out the desired end etetely ebjeeteef my inventee.

`What I, claim is:

l. The combination` with a. seyvingma; chine enel e e111:` felding;guide. ettelehed, thereto, of a reciprocating` knife located.l inadvance of the needle and in a cutaway-por, tion yin the side Vof, saidvguide. back, ofthe, mouthI ofI the same, and means driven, bya, movingpartofthe sewing machine, fortre-` ciprocating said knifeisdthat itwill(xiii/offl from e, fabric introduced, into the. guide@ narrow ,straightedge, strip. f

2. The combination with a sewing.ma,-

AsY stated above, if two,

chine and a hem folding guide attached thereto, of a cutting deviceconsisting of a stationary and an intemnittently reciprocating bladelocated in a cut-away! part in the 5 side of said guide back of themouth of the same, connections between said reciprocating blade and theintermittently oscillating rocker bar that lifts the feed bed, Jforoperating the said blade during the intervals of reet of the fabric andmeans for adjusting 10 the relative positions of the two members of thecutting device and the throw of the reciprocating blade.

In testimony whereof I hereto affix my signature.

RAPHAEL NETTER.

